Magnetic field probe with encapsulated MR-active substance

Abstract

A magnetic field probe ( 1 ) having a capsule ( 3 ), in which an MR-active substance ( 5 ) is encapsulated. Two coils ( 7, 9 ) are preferably arranged in the capsule ( 3 ). Advantageous production methods for magnetic field probes ( 1 ) are also described, as well as advantageous uses of the magnetic field probe ( 1 ) and methods in which magnetic field probes ( 1 ) of this kind and arrangements of magnetic field probes ( 1 ) are used.

The invention claimed is: 
     
       1. A magnetic field probe ( 1 ), comprising:
 a capsule ( 3 ) encapsulating an MR-active substance ( 5 ); 
 a first coil ( 7 ) disposed within the capsule, the first coil at least one of receiving a signal from the MR-active substance or exciting the MR-active substance; 
 the MR-active substance ( 5 ) fills a cavity ( 11 ) formed by the capsule ( 3 ), 
 wherein the cavity is closed off from outside, and 
 wherein the MR-active substance forms direct contact with the capsule. 
 
     
     
       2. The magnetic field probe ( 1 ) as claimed in  claim 1 , wherein the capsule ( 3 ) is in spherical form. 
     
     
       3. The magnetic field probe ( 1 ) as claimed in  claim 1 , wherein the capsule ( 3 ) is formed from a material ( 19 ) of homogeneous composition.